'Work' in the Bible

since the One at work in Peter for an apostleship to the circumcised was also at work in me for the Gentiles.

So then, does God supply you with the Spirit and work miracles among you by the works of the law or by hearing with faith?

But each person should examine his own work, and then he will have a reason for boasting in himself alone, and not in respect to someone else.

Therefore, as we have opportunity, we must work for the good of all, especially for those who belong to the household of faith.